Explanation

In circular motion, the centripetal force  𝐹 required to keep an object moving in a circular path is given by the formula:

𝐹= 𝑚 𝑣^2/ 𝑟

Where:

m is the mass of the object,

v is the velocity of the object,

r is the radius of the circular path.

If the velocity v is doubled, the centripetal force becomes:

F ′ =  m(2v) ^2/r = 4mv ^2/r =4F

This means that if the velocity is doubled, the force will be four times the original, not twice or half the original.

Therefore, neither of the options provided is correct.

Explanation

Potential divider is a circuit that gives us continuously varying potential.

Examples of the potential dividers are Rheostat and Potentiometer

Explanation

In the metric system, the SI unit of length is a meter which is

defined as: “The length of the path traveled by light in a vacuum within 1⁄299792458 seconds.”

Common symbols: l

ND18-9-2023

Explanation

• The hottest stars appear blue in color.
• Blue stars are very hot, with surface temperatures reaching tens of thousands of degrees Celsius.
• It emitting predominantly blue and ultraviolet light.

Explanation

The sun rises in the East and sets in the West.

which means that the Earth is rotating from West to East. 

Earth revolves in orbit around the Sun in 365 days, 6 hours, 9 minutes.

with reference to the stars, at a speed ranging from 29.29 to 30.29 km/s.

The 6 hours, 9 minutes add up to about an extra day every fourth year,

which is designated a leap year, with the extra day added as February 29th.

Explanation

. LASER  stands for Light Amplification by Stimulated Emission of Radiations

LASER types

• Gas LASER
• Semiconductor LASER
• Chemical LASER
• Liquid or Dye LASER
• Excimer LASER

Properties of LASER

Explanation

Watts are defined as 1 Watt = 1 Joule per second (1W = 1 J/s)

1 kW = 1000 J/s. 

Additional Information:

The SI Unit of power is Watt.

1 Watt = 1 Joule/second.

1 Joule = 1 Newton-meter

1 Watt = 1 Newton=meter/second

NA21-8-2023

Explanation

CNES is a space agency in France

CNES stands for National Centre for Space Studies.

CNES Formed  in 19 December 1961

Explanation

Thermal power generation consists of using steam power 

Thermal energy sources are fossil fuels like:

natural gas, coal, and oil

as well as solar heat

heat pump electric heat

and geothermal heat.

Explanation

Liquified HCl has been cooled until the gas turns into a liquid.

ND06-08-2023